mirror of
https://github.com/swift-server/async-http-client.git
synced 2026-06-02 07:37:34 +00:00
Cory Benfield
7dc119c7ed
Motivation This patch adds support for HTTP/1 connection pre-warming. This allows the user to request that the HTTP/1 connection pool create and maintain extra connections, above-and-beyond those strictly needed to run the pool. This pool can be used to absorb small spikes in request traffic without increasing latency to account for connection creation. Modifications - Added new configuration properties for pre-warmed connections. - Amended the HTTP/1 state machine to create new connections where necessary. - Added state machine tests. Results Pre-warmed connections are available.
1497 lines
69 KiB
Swift
1497 lines
69 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the AsyncHTTPClient open source project
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//
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// Copyright (c) 2021 Apple Inc. and the AsyncHTTPClient project authors
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// Licensed under Apache License v2.0
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//
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// See LICENSE.txt for license information
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// See CONTRIBUTORS.txt for the list of AsyncHTTPClient project authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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//===----------------------------------------------------------------------===//
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import NIOCore
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import NIOEmbedded
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import NIOHTTP1
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import NIOPosix
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import XCTest
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@testable import AsyncHTTPClient
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class HTTPConnectionPool_HTTP1StateMachineTests: XCTestCase {
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func testCreatingAndFailingConnections() {
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struct SomeError: Error, Equatable {}
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let elg = EmbeddedEventLoopGroup(loops: 4)
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defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
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var state = HTTPConnectionPool.StateMachine(
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idGenerator: .init(),
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maximumConcurrentHTTP1Connections: 8,
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retryConnectionEstablishment: true,
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preferHTTP1: true,
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maximumConnectionUses: nil,
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preWarmedHTTP1ConnectionCount: 0
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)
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var connections = MockConnectionPool()
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var queuer = MockRequestQueuer()
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// for the first eight requests, the pool should try to create new connections.
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for _ in 0..<8 {
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let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
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let request = HTTPConnectionPool.Request(mockRequest)
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let action = state.executeRequest(request)
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guard case .createConnection(let connectionID, let connectionEL) = action.connection else {
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return XCTFail("Unexpected connection action")
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}
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XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), action.request)
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XCTAssert(connectionEL === mockRequest.eventLoop)
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XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
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XCTAssertNoThrow(try queuer.queue(mockRequest, id: request.id))
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}
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// the next eight requests should only be queued.
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for _ in 0..<8 {
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let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
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let request = HTTPConnectionPool.Request(mockRequest)
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let action = state.executeRequest(request)
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guard case .none = action.connection else {
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return XCTFail("Unexpected connection action")
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}
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XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), action.request)
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XCTAssertNoThrow(try queuer.queue(mockRequest, id: request.id))
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}
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// timeout all queued requests except for two
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// fail all connection attempts
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while let randomConnectionID = connections.randomStartingConnection() {
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XCTAssertNoThrow(try connections.failConnectionCreation(randomConnectionID))
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let action = state.failedToCreateNewConnection(SomeError(), connectionID: randomConnectionID)
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// After a failed connection attempt, must not fail a request. Instead we should retry
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// to create the connection with a backoff and a small jitter. The request should only
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// be failed, once the connection setup timeout is hit or the request reaches it
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// deadline.
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XCTAssertEqual(action.request, .none)
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guard case .scheduleBackoffTimer(randomConnectionID, backoff: _, on: _) = action.connection else {
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return XCTFail("Unexpected request action: \(action.request)")
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}
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XCTAssertNoThrow(try connections.startConnectionBackoffTimer(randomConnectionID))
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}
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// cancel all queued requests
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while let request = queuer.timeoutRandomRequest() {
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let cancelAction = state.cancelRequest(request.0)
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XCTAssertEqual(cancelAction.connection, .none)
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XCTAssertEqual(cancelAction.request, .failRequest(.init(request.1), SomeError(), cancelTimeout: true))
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}
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// connection backoff done
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while let connectionID = connections.randomBackingOffConnection() {
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XCTAssertNoThrow(try connections.connectionBackoffTimerDone(connectionID))
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let backoffAction = state.connectionCreationBackoffDone(connectionID)
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XCTAssertEqual(backoffAction.connection, .none)
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XCTAssertEqual(backoffAction.request, .none)
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}
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XCTAssert(queuer.isEmpty)
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XCTAssert(connections.isEmpty)
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}
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func testCreatingAndFailingConnectionsWithoutRetry() {
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struct SomeError: Error, Equatable {}
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let elg = EmbeddedEventLoopGroup(loops: 4)
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defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
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var state = HTTPConnectionPool.StateMachine(
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idGenerator: .init(),
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maximumConcurrentHTTP1Connections: 8,
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retryConnectionEstablishment: false,
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preferHTTP1: true,
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maximumConnectionUses: nil,
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preWarmedHTTP1ConnectionCount: 0
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)
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var connections = MockConnectionPool()
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var queuer = MockRequestQueuer()
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// for the first eight requests, the pool should try to create new connections.
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for _ in 0..<8 {
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let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
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let request = HTTPConnectionPool.Request(mockRequest)
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let action = state.executeRequest(request)
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guard case .createConnection(let connectionID, let connectionEL) = action.connection else {
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return XCTFail("Unexpected connection action")
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}
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XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), action.request)
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XCTAssert(connectionEL === mockRequest.eventLoop)
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XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
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XCTAssertNoThrow(try queuer.queue(mockRequest, id: request.id))
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}
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// the next eight requests should only be queued.
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for _ in 0..<8 {
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let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
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let request = HTTPConnectionPool.Request(mockRequest)
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let action = state.executeRequest(request)
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guard case .none = action.connection else {
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return XCTFail("Unexpected connection action")
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}
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XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), action.request)
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XCTAssertNoThrow(try queuer.queue(mockRequest, id: request.id))
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}
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// the first failure should cancel all requests because we have disabled connection establishtment retry
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let randomConnectionID = connections.randomStartingConnection()!
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XCTAssertNoThrow(try connections.failConnectionCreation(randomConnectionID))
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let action = state.failedToCreateNewConnection(SomeError(), connectionID: randomConnectionID)
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XCTAssertEqual(action.connection, .none)
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guard case .failRequestsAndCancelTimeouts(let requestsToFail, let requestError) = action.request else {
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return XCTFail("Unexpected request action: \(action.request)")
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}
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XCTAssertEqualTypeAndValue(requestError, SomeError())
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for requestToFail in requestsToFail {
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XCTAssertNoThrow(try queuer.fail(requestToFail.id, request: requestToFail.__testOnly_wrapped_request()))
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}
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// all requests have been canceled and therefore nothing should happen if a connection fails
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while let randomConnectionID = connections.randomStartingConnection() {
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XCTAssertNoThrow(try connections.failConnectionCreation(randomConnectionID))
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let action = state.failedToCreateNewConnection(SomeError(), connectionID: randomConnectionID)
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XCTAssertEqual(action, .none)
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}
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XCTAssert(queuer.isEmpty)
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XCTAssert(connections.isEmpty)
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}
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func testConnectionFailureBackoff() {
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let elg = EmbeddedEventLoopGroup(loops: 4)
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defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
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var state = HTTPConnectionPool.StateMachine(
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idGenerator: .init(),
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maximumConcurrentHTTP1Connections: 2,
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retryConnectionEstablishment: true,
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preferHTTP1: true,
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maximumConnectionUses: nil,
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preWarmedHTTP1ConnectionCount: 0
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)
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let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
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let request = HTTPConnectionPool.Request(mockRequest)
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let action = state.executeRequest(request)
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XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), action.request)
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// 1. connection attempt
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guard case .createConnection(let connectionID, on: let connectionEL) = action.connection else {
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return XCTFail("Unexpected connection action: \(action.connection)")
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}
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XCTAssert(connectionEL === mockRequest.eventLoop) // XCTAssertIdentical not available on Linux
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let failedConnect1 = state.failedToCreateNewConnection(
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HTTPClientError.connectTimeout,
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connectionID: connectionID
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)
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XCTAssertEqual(failedConnect1.request, .none)
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guard case .scheduleBackoffTimer(connectionID, let backoffTimeAmount1, _) = failedConnect1.connection else {
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return XCTFail("Unexpected connection action: \(failedConnect1.connection)")
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}
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// 2. connection attempt
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let backoffDoneAction = state.connectionCreationBackoffDone(connectionID)
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XCTAssertEqual(backoffDoneAction.request, .none)
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guard case .createConnection(let newConnectionID, on: let newEventLoop) = backoffDoneAction.connection else {
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return XCTFail("Unexpected connection action: \(backoffDoneAction.connection)")
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}
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XCTAssertGreaterThan(newConnectionID, connectionID)
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XCTAssert(connectionEL === newEventLoop) // XCTAssertIdentical not available on Linux
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let failedConnect2 = state.failedToCreateNewConnection(
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HTTPClientError.connectTimeout,
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connectionID: newConnectionID
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)
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XCTAssertEqual(failedConnect2.request, .none)
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guard case .scheduleBackoffTimer(newConnectionID, let backoffTimeAmount2, _) = failedConnect2.connection else {
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return XCTFail("Unexpected connection action: \(failedConnect2.connection)")
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}
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XCTAssertNotEqual(backoffTimeAmount2, backoffTimeAmount1)
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// 3. request times out
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let failRequest = state.timeoutRequest(request.id)
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guard case .failRequest(let requestToFail, let requestError, cancelTimeout: false) = failRequest.request else {
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return XCTFail("Unexpected request action: \(action.request)")
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}
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// XCTAssertIdentical not available on Linux
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XCTAssert(requestToFail.__testOnly_wrapped_request() === mockRequest)
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XCTAssertEqual(requestError as? HTTPClientError, .connectTimeout)
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XCTAssertEqual(failRequest.connection, .none)
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// 4. retry connection, but no more queued requests.
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XCTAssertEqual(state.connectionCreationBackoffDone(newConnectionID), .none)
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}
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func testCancelRequestWorks() {
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let elg = EmbeddedEventLoopGroup(loops: 4)
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defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
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var state = HTTPConnectionPool.StateMachine(
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idGenerator: .init(),
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maximumConcurrentHTTP1Connections: 2,
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retryConnectionEstablishment: true,
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preferHTTP1: true,
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maximumConnectionUses: nil,
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preWarmedHTTP1ConnectionCount: 0
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)
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let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
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let request = HTTPConnectionPool.Request(mockRequest)
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let executeAction = state.executeRequest(request)
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XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), executeAction.request)
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// 1. connection attempt
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guard case .createConnection(let connectionID, on: let connectionEL) = executeAction.connection else {
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return XCTFail("Unexpected connection action: \(executeAction.connection)")
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}
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XCTAssert(connectionEL === mockRequest.eventLoop) // XCTAssertIdentical not available on Linux
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// 2. cancel request
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let cancelAction = state.cancelRequest(request.id)
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XCTAssertEqual(cancelAction.request, .failRequest(request, HTTPClientError.cancelled, cancelTimeout: true))
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XCTAssertEqual(cancelAction.connection, .none)
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// 3. request timeout triggers to late
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XCTAssertEqual(state.timeoutRequest(request.id), .none, "To late timeout is ignored")
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// 4. succeed connection attempt
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let connectedAction = state.newHTTP1ConnectionCreated(
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.__testOnly_connection(id: connectionID, eventLoop: connectionEL)
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)
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XCTAssertEqual(connectedAction.request, .none, "Request must not be executed")
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XCTAssertEqual(connectedAction.connection, .scheduleTimeoutTimer(connectionID, on: connectionEL))
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}
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func testExecuteOnShuttingDownPool() {
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let elg = EmbeddedEventLoopGroup(loops: 4)
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defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
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var state = HTTPConnectionPool.StateMachine(
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idGenerator: .init(),
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maximumConcurrentHTTP1Connections: 2,
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retryConnectionEstablishment: true,
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preferHTTP1: true,
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maximumConnectionUses: nil,
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preWarmedHTTP1ConnectionCount: 0
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)
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let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
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let request = HTTPConnectionPool.Request(mockRequest)
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let executeAction = state.executeRequest(request)
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XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), executeAction.request)
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// 1. connection attempt
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guard case .createConnection(let connectionID, on: let connectionEL) = executeAction.connection else {
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return XCTFail("Unexpected connection action: \(executeAction.connection)")
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}
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XCTAssert(connectionEL === mockRequest.eventLoop) // XCTAssertIdentical not available on Linux
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// 2. connection succeeds
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let connection: HTTPConnectionPool.Connection = .__testOnly_connection(
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id: connectionID,
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eventLoop: connectionEL
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)
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let connectedAction = state.newHTTP1ConnectionCreated(connection)
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guard case .executeRequest(request, connection, cancelTimeout: true) = connectedAction.request else {
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return XCTFail("Unexpected request action: \(connectedAction.request)")
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}
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XCTAssert(request.__testOnly_wrapped_request() === mockRequest) // XCTAssertIdentical not available on Linux
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XCTAssertEqual(connectedAction.connection, .none)
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// 3. shutdown
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let shutdownAction = state.shutdown()
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XCTAssertEqual(.none, shutdownAction.request)
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guard case .cleanupConnections(let cleanupContext, isShutdown: .no) = shutdownAction.connection else {
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return XCTFail("Unexpected connection action: \(shutdownAction.connection)")
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}
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XCTAssertEqual(cleanupContext.cancel.count, 1)
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XCTAssertEqual(cleanupContext.cancel.first?.id, connectionID)
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XCTAssertEqual(cleanupContext.close, [])
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XCTAssertEqual(cleanupContext.connectBackoff, [])
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// 4. execute another request
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let finalMockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
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let finalRequest = HTTPConnectionPool.Request(finalMockRequest)
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let failAction = state.executeRequest(finalRequest)
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XCTAssertEqual(failAction.connection, .none)
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XCTAssertEqual(
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failAction.request,
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.failRequest(finalRequest, HTTPClientError.alreadyShutdown, cancelTimeout: false)
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)
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// 5. close open connection
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let closeAction = state.http1ConnectionClosed(connectionID)
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XCTAssertEqual(closeAction.connection, .cleanupConnections(.init(), isShutdown: .yes(unclean: true)))
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XCTAssertEqual(closeAction.request, .none)
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}
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func testRequestsAreQueuedIfAllConnectionsAreInUseAndRequestsAreDequeuedInOrder() {
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let elg = EmbeddedEventLoopGroup(loops: 4)
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defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
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guard var (connections, state) = try? MockConnectionPool.http1(elg: elg, numberOfConnections: 8) else {
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return XCTFail("Test setup failed")
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}
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XCTAssertEqual(connections.parked, 8)
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// Add eight requests to fill all connections
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for _ in 0..<8 {
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let eventLoop = elg.next()
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guard
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let expectedConnection = connections.newestParkedConnection(for: eventLoop)
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?? connections.newestParkedConnection
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else {
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return XCTFail("Expected to still have connections available")
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}
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let mockRequest = MockHTTPScheduableRequest(eventLoop: eventLoop)
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let request = HTTPConnectionPool.Request(mockRequest)
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let action = state.executeRequest(request)
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XCTAssertEqual(action.connection, .cancelTimeoutTimer(expectedConnection.id))
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guard case .executeRequest(let returnedRequest, expectedConnection, cancelTimeout: false) = action.request
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else {
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return XCTFail("Expected to execute a request next, but got: \(action.request)")
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}
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XCTAssert(mockRequest === returnedRequest.__testOnly_wrapped_request())
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XCTAssertNoThrow(try connections.activateConnection(expectedConnection.id))
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XCTAssertNoThrow(try connections.execute(mockRequest, on: expectedConnection))
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}
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// Add 100 requests to fill request queue
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var queuedRequestsOrder = CircularBuffer<MockRequestQueuer.RequestID>()
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var queuer = MockRequestQueuer()
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for _ in 0..<100 {
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let eventLoop = elg.next()
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let mockRequest = MockHTTPScheduableRequest(eventLoop: eventLoop, requiresEventLoopForChannel: false)
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let request = HTTPConnectionPool.Request(mockRequest)
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let action = state.executeRequest(request)
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XCTAssertEqual(action.connection, .none)
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XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), action.request)
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XCTAssertNoThrow(try queuer.queue(mockRequest, id: request.id))
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queuedRequestsOrder.append(request.id)
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}
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while let connection = connections.randomLeasedConnection() {
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XCTAssertNoThrow(try connections.finishExecution(connection.id))
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let action = state.http1ConnectionReleased(connection.id)
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switch action.connection {
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case .scheduleTimeoutTimer(connection.id, on: let timerEL):
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// if all queued requests are processed, the connection will be parked
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XCTAssert(queuedRequestsOrder.isEmpty)
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XCTAssertEqual(action.request, .none)
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XCTAssert(connection.eventLoop === timerEL)
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XCTAssertNoThrow(try connections.parkConnection(connection.id))
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case .none:
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guard case .executeRequest(let request, connection, cancelTimeout: true) = action.request else {
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return XCTFail("Unexpected request action: \(action.request)")
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}
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XCTAssertEqual(request.id, queuedRequestsOrder.popFirst())
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let mockRequest = request.__testOnly_wrapped_request()
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XCTAssertNoThrow(try connections.execute(queuer.get(request.id, request: mockRequest), on: connection))
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default:
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XCTFail("Unexpected connection action: \(action)")
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}
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}
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XCTAssertEqual(connections.parked, 8)
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XCTAssert(queuer.isEmpty)
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}
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func testBestConnectionIsPicked() {
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let elg = MultiThreadedEventLoopGroup(numberOfThreads: 64)
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defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
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guard var (connections, state) = try? MockConnectionPool.http1(elg: elg, numberOfConnections: 8) else {
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return XCTFail("Test setup failed")
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}
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for index in 1...300 {
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// Every iteration we start with eight parked connections
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XCTAssertEqual(connections.parked, 8)
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var reqEventLoop: EventLoop = elg.next()
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for _ in 0..<((0..<63).randomElement()!) {
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// pick a random eventLoop for the next request
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reqEventLoop = elg.next()
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}
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// 10% of the cases enforce the eventLoop
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let elRequired = (0..<10).randomElement().flatMap { $0 == 0 ? true : false }!
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let mockRequest = MockHTTPScheduableRequest(
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eventLoop: reqEventLoop,
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requiresEventLoopForChannel: elRequired
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)
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let request = HTTPConnectionPool.Request(mockRequest)
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let action = state.executeRequest(request)
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|
|
|
switch action.connection {
|
|
case .createConnection(let connectionID, on: let connEventLoop):
|
|
XCTAssertTrue(elRequired)
|
|
XCTAssertNil(connections.newestParkedConnection(for: reqEventLoop))
|
|
XCTAssert(connEventLoop === reqEventLoop)
|
|
XCTAssertEqual(action.request, .scheduleRequestTimeout(for: request, on: reqEventLoop))
|
|
|
|
let connection: HTTPConnectionPool.Connection = .__testOnly_connection(
|
|
id: connectionID,
|
|
eventLoop: connEventLoop
|
|
)
|
|
let createdAction = state.newHTTP1ConnectionCreated(connection)
|
|
XCTAssertEqual(createdAction.request, .executeRequest(request, connection, cancelTimeout: true))
|
|
XCTAssertEqual(createdAction.connection, .none)
|
|
|
|
let doneAction = state.http1ConnectionReleased(connectionID)
|
|
XCTAssertEqual(doneAction.request, .none)
|
|
XCTAssertEqual(doneAction.connection, .closeConnection(connection, isShutdown: .no))
|
|
XCTAssertEqual(state.http1ConnectionClosed(connectionID), .none)
|
|
|
|
case .cancelTimeoutTimer(let connectionID):
|
|
guard
|
|
let expectedConnection = connections.newestParkedConnection(for: reqEventLoop)
|
|
?? connections.newestParkedConnection
|
|
else {
|
|
return XCTFail("Expected to have connections available")
|
|
}
|
|
|
|
if elRequired {
|
|
XCTAssert(expectedConnection.eventLoop === reqEventLoop)
|
|
}
|
|
|
|
XCTAssertEqual(
|
|
connectionID,
|
|
expectedConnection.id,
|
|
"Request is scheduled on the connection we expected"
|
|
)
|
|
XCTAssertNoThrow(try connections.activateConnection(connectionID))
|
|
|
|
guard case .executeRequest(let request, let connection, cancelTimeout: false) = action.request else {
|
|
return XCTFail("Expected to execute a request, but got: \(action.request)")
|
|
}
|
|
XCTAssertEqual(connection, expectedConnection)
|
|
XCTAssertNoThrow(try connections.execute(request.__testOnly_wrapped_request(), on: connection))
|
|
XCTAssertNoThrow(try connections.finishExecution(connection.id))
|
|
|
|
XCTAssertEqual(
|
|
state.http1ConnectionReleased(connection.id),
|
|
.init(request: .none, connection: .scheduleTimeoutTimer(connection.id, on: connection.eventLoop))
|
|
)
|
|
XCTAssertNoThrow(try connections.parkConnection(connectionID))
|
|
|
|
default:
|
|
XCTFail("Unexpected connection action in iteration \(index): \(action.connection)")
|
|
}
|
|
}
|
|
|
|
XCTAssertEqual(connections.parked, 8)
|
|
}
|
|
|
|
func testConnectionAbortIsIgnoredIfThereAreNoQueuedRequests() {
|
|
let elg = MultiThreadedEventLoopGroup(numberOfThreads: 1)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
guard var (connections, state) = try? MockConnectionPool.http1(elg: elg, numberOfConnections: 8) else {
|
|
return XCTFail("Test setup failed")
|
|
}
|
|
|
|
XCTAssertEqual(connections.parked, 8)
|
|
|
|
// close a leased connection == abort
|
|
let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
|
|
let request = HTTPConnectionPool.Request(mockRequest)
|
|
guard let connectionToAbort = connections.newestParkedConnection else {
|
|
return XCTFail("Expected to have a parked connection")
|
|
}
|
|
let action = state.executeRequest(request)
|
|
XCTAssertEqual(action.connection, .cancelTimeoutTimer(connectionToAbort.id))
|
|
XCTAssertNoThrow(try connections.activateConnection(connectionToAbort.id))
|
|
XCTAssertEqual(action.request, .executeRequest(request, connectionToAbort, cancelTimeout: false))
|
|
XCTAssertNoThrow(try connections.execute(mockRequest, on: connectionToAbort))
|
|
XCTAssertEqual(connections.parked, 7)
|
|
XCTAssertEqual(connections.used, 1)
|
|
XCTAssertNoThrow(try connections.abortConnection(connectionToAbort.id))
|
|
XCTAssertEqual(state.http1ConnectionClosed(connectionToAbort.id), .none)
|
|
XCTAssertEqual(connections.parked, 7)
|
|
XCTAssertEqual(connections.used, 0)
|
|
}
|
|
|
|
func testConnectionCloseLeadsToTumbleWeedIfThereNoQueuedRequests() {
|
|
let elg = EmbeddedEventLoopGroup(loops: 1)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
guard var (connections, state) = try? MockConnectionPool.http1(elg: elg, numberOfConnections: 8) else {
|
|
return XCTFail("Test setup failed")
|
|
}
|
|
|
|
XCTAssertEqual(connections.parked, 8)
|
|
|
|
// close a parked connection
|
|
guard let connectionToClose = connections.randomParkedConnection() else {
|
|
return XCTFail("Expected to have a parked connection")
|
|
}
|
|
XCTAssertNoThrow(try connections.closeConnection(connectionToClose))
|
|
XCTAssertEqual(state.http1ConnectionClosed(connectionToClose.id), .none)
|
|
XCTAssertEqual(connections.parked, 7)
|
|
}
|
|
|
|
func testConnectionAbortLeadsToNewConnectionsIfThereAreQueuedRequests() {
|
|
let elg = EmbeddedEventLoopGroup(loops: 8)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
guard var (connections, state) = try? MockConnectionPool.http1(elg: elg, numberOfConnections: 8) else {
|
|
return XCTFail("Test setup failed")
|
|
}
|
|
|
|
XCTAssertEqual(connections.parked, 8)
|
|
|
|
// Add eight requests to fill all connections
|
|
for _ in 0..<8 {
|
|
let eventLoop = elg.next()
|
|
guard
|
|
let expectedConnection = connections.newestParkedConnection(for: eventLoop)
|
|
?? connections.newestParkedConnection
|
|
else {
|
|
return XCTFail("Expected to still have connections available")
|
|
}
|
|
|
|
let mockRequest = MockHTTPScheduableRequest(eventLoop: eventLoop)
|
|
let request = HTTPConnectionPool.Request(mockRequest)
|
|
let action = state.executeRequest(request)
|
|
|
|
XCTAssertEqual(action.connection, .cancelTimeoutTimer(expectedConnection.id))
|
|
XCTAssertEqual(action.request, .executeRequest(request, expectedConnection, cancelTimeout: false))
|
|
|
|
XCTAssertNoThrow(try connections.activateConnection(expectedConnection.id))
|
|
XCTAssertNoThrow(try connections.execute(mockRequest, on: expectedConnection))
|
|
}
|
|
|
|
// Add 100 requests to fill request queue
|
|
var queuedRequestsOrder = CircularBuffer<MockRequestQueuer.RequestID>()
|
|
var queuer = MockRequestQueuer()
|
|
for _ in 0..<100 {
|
|
let eventLoop = elg.next()
|
|
|
|
let mockRequest = MockHTTPScheduableRequest(eventLoop: eventLoop, requiresEventLoopForChannel: false)
|
|
let request = HTTPConnectionPool.Request(mockRequest)
|
|
let action = state.executeRequest(request)
|
|
|
|
XCTAssertEqual(.none, action.connection)
|
|
XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), action.request)
|
|
XCTAssertNoThrow(try queuer.queue(mockRequest, id: request.id))
|
|
queuedRequestsOrder.append(request.id)
|
|
}
|
|
|
|
while let closedConnection = connections.randomLeasedConnection() {
|
|
XCTAssertNoThrow(try connections.abortConnection(closedConnection.id))
|
|
XCTAssertEqual(connections.parked, 0)
|
|
let action = state.http1ConnectionClosed(closedConnection.id)
|
|
|
|
switch action.connection {
|
|
case .createConnection(let newConnectionID, on: let eventLoop):
|
|
XCTAssertEqual(action.request, .none)
|
|
XCTAssertNoThrow(try connections.createConnection(newConnectionID, on: eventLoop))
|
|
XCTAssertEqual(connections.starting, 1)
|
|
|
|
var maybeNewConnection: HTTPConnectionPool.Connection?
|
|
XCTAssertNoThrow(maybeNewConnection = try connections.succeedConnectionCreationHTTP1(newConnectionID))
|
|
guard let newConnection = maybeNewConnection else { return XCTFail("Expected to get a new connection") }
|
|
let afterRecreationAction = state.newHTTP1ConnectionCreated(newConnection)
|
|
XCTAssertEqual(afterRecreationAction.connection, .none)
|
|
guard
|
|
case .executeRequest(let request, newConnection, cancelTimeout: true) = afterRecreationAction
|
|
.request
|
|
else {
|
|
return XCTFail("Unexpected request action: \(action.request)")
|
|
}
|
|
|
|
XCTAssertEqual(request.id, queuedRequestsOrder.popFirst())
|
|
XCTAssertNoThrow(
|
|
try connections.execute(
|
|
queuer.get(request.id, request: request.__testOnly_wrapped_request()),
|
|
on: newConnection
|
|
)
|
|
)
|
|
|
|
case .none:
|
|
XCTAssert(queuer.isEmpty)
|
|
default:
|
|
XCTFail("Unexpected connection action: \(action.connection)")
|
|
}
|
|
}
|
|
}
|
|
|
|
func testParkedConnectionTimesOut() {
|
|
let elg = EmbeddedEventLoopGroup(loops: 1)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
guard var (connections, state) = try? MockConnectionPool.http1(elg: elg, numberOfConnections: 1) else {
|
|
return XCTFail("Test setup failed")
|
|
}
|
|
|
|
guard let connection = connections.randomParkedConnection() else {
|
|
return XCTFail("Expected to have one parked connection")
|
|
}
|
|
|
|
let action = state.connectionIdleTimeout(connection.id, on: connection.eventLoop)
|
|
XCTAssertEqual(action.connection, .closeConnection(connection, isShutdown: .no))
|
|
XCTAssertEqual(action.request, .none)
|
|
XCTAssertNoThrow(try connections.closeConnection(connection))
|
|
}
|
|
|
|
func testConnectionPoolFullOfParkedConnectionsIsShutdownImmediately() {
|
|
let elg = EmbeddedEventLoopGroup(loops: 8)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
guard var (connections, state) = try? MockConnectionPool.http1(elg: elg, numberOfConnections: 8) else {
|
|
return XCTFail("Test setup failed")
|
|
}
|
|
|
|
XCTAssertEqual(connections.parked, 8)
|
|
let action = state.shutdown()
|
|
XCTAssertEqual(.none, action.request)
|
|
|
|
guard case .cleanupConnections(let closeContext, isShutdown: .yes(unclean: false)) = action.connection else {
|
|
return XCTFail("Unexpected connection event: \(action.connection)")
|
|
}
|
|
|
|
XCTAssertEqual(closeContext.close.count, 8)
|
|
|
|
for connection in closeContext.close {
|
|
XCTAssertNoThrow(try connections.closeConnection(connection))
|
|
}
|
|
|
|
XCTAssertEqual(connections.count, 0)
|
|
}
|
|
|
|
func testParkedConnectionTimesOutButIsAlsoClosedByRemote() {
|
|
let elg = MultiThreadedEventLoopGroup(numberOfThreads: 1)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
guard var (connections, state) = try? MockConnectionPool.http1(elg: elg, numberOfConnections: 1) else {
|
|
return XCTFail("Test setup failed")
|
|
}
|
|
|
|
guard let connection = connections.randomParkedConnection() else {
|
|
return XCTFail("Expected to have one parked connection")
|
|
}
|
|
|
|
// triggered by remote peer
|
|
XCTAssertNoThrow(try connections.abortConnection(connection.id))
|
|
XCTAssertEqual(state.http1ConnectionClosed(connection.id), .none)
|
|
|
|
// triggered by timer
|
|
XCTAssertEqual(state.connectionIdleTimeout(connection.id, on: connection.eventLoop), .none)
|
|
}
|
|
|
|
func testConnectionBackoffVsShutdownRace() {
|
|
let elg = EmbeddedEventLoopGroup(loops: 2)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
var state = HTTPConnectionPool.StateMachine(
|
|
idGenerator: .init(),
|
|
maximumConcurrentHTTP1Connections: 6,
|
|
retryConnectionEstablishment: true,
|
|
preferHTTP1: true,
|
|
maximumConnectionUses: nil,
|
|
preWarmedHTTP1ConnectionCount: 0
|
|
)
|
|
|
|
let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next(), requiresEventLoopForChannel: false)
|
|
let request = HTTPConnectionPool.Request(mockRequest)
|
|
|
|
let executeAction = state.executeRequest(request)
|
|
guard case .createConnection(let connectionID, on: let connEL) = executeAction.connection else {
|
|
return XCTFail("Expected to create a connection")
|
|
}
|
|
|
|
XCTAssertEqual(executeAction.request, .scheduleRequestTimeout(for: request, on: mockRequest.eventLoop))
|
|
|
|
let failAction = state.failedToCreateNewConnection(HTTPClientError.cancelled, connectionID: connectionID)
|
|
guard case .scheduleBackoffTimer(connectionID, backoff: _, on: let timerEL) = failAction.connection else {
|
|
return XCTFail("Expected to create a backoff timer")
|
|
}
|
|
XCTAssert(timerEL === connEL)
|
|
XCTAssertEqual(failAction.request, .none)
|
|
|
|
let shutdownAction = state.shutdown()
|
|
guard case .cleanupConnections(let context, isShutdown: .yes(unclean: true)) = shutdownAction.connection else {
|
|
return XCTFail("Expected to cleanup")
|
|
}
|
|
XCTAssertEqual(context.close.count, 0)
|
|
XCTAssertEqual(context.cancel.count, 0)
|
|
XCTAssertEqual(context.connectBackoff, [connectionID])
|
|
XCTAssertEqual(shutdownAction.request, .failRequestsAndCancelTimeouts([request], HTTPClientError.cancelled))
|
|
|
|
XCTAssertEqual(state.connectionCreationBackoffDone(connectionID), .none)
|
|
}
|
|
|
|
func testRequestThatTimesOutIsFailedWithLastConnectionCreationError() {
|
|
let elg = EmbeddedEventLoopGroup(loops: 1)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
var state = HTTPConnectionPool.StateMachine(
|
|
idGenerator: .init(),
|
|
maximumConcurrentHTTP1Connections: 6,
|
|
retryConnectionEstablishment: true,
|
|
preferHTTP1: true,
|
|
maximumConnectionUses: nil,
|
|
preWarmedHTTP1ConnectionCount: 0
|
|
)
|
|
|
|
let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next(), requiresEventLoopForChannel: false)
|
|
let request = HTTPConnectionPool.Request(mockRequest)
|
|
|
|
let executeAction = state.executeRequest(request)
|
|
guard case .createConnection(let connectionID, on: let connEL) = executeAction.connection else {
|
|
return XCTFail("Expected to create a connection")
|
|
}
|
|
|
|
XCTAssertEqual(executeAction.request, .scheduleRequestTimeout(for: request, on: mockRequest.eventLoop))
|
|
|
|
let failAction = state.failedToCreateNewConnection(
|
|
HTTPClientError.httpProxyHandshakeTimeout,
|
|
connectionID: connectionID
|
|
)
|
|
guard case .scheduleBackoffTimer(connectionID, backoff: _, on: let timerEL) = failAction.connection else {
|
|
return XCTFail("Expected to create a backoff timer")
|
|
}
|
|
XCTAssert(timerEL === connEL)
|
|
XCTAssertEqual(failAction.request, .none)
|
|
|
|
let timeoutAction = state.timeoutRequest(request.id)
|
|
XCTAssertEqual(
|
|
timeoutAction.request,
|
|
.failRequest(request, HTTPClientError.httpProxyHandshakeTimeout, cancelTimeout: false)
|
|
)
|
|
XCTAssertEqual(timeoutAction.connection, .none)
|
|
}
|
|
|
|
func testRequestThatTimesOutBeforeAConnectionIsEstablishedIsFailedWithConnectTimeoutError() {
|
|
let eventLoop = EmbeddedEventLoop()
|
|
defer { XCTAssertNoThrow(try eventLoop.syncShutdownGracefully()) }
|
|
|
|
var state = HTTPConnectionPool.StateMachine(
|
|
idGenerator: .init(),
|
|
maximumConcurrentHTTP1Connections: 6,
|
|
retryConnectionEstablishment: true,
|
|
preferHTTP1: true,
|
|
maximumConnectionUses: nil,
|
|
preWarmedHTTP1ConnectionCount: 0
|
|
)
|
|
|
|
let mockRequest = MockHTTPScheduableRequest(eventLoop: eventLoop.next(), requiresEventLoopForChannel: false)
|
|
let request = HTTPConnectionPool.Request(mockRequest)
|
|
|
|
let executeAction = state.executeRequest(request)
|
|
guard case .createConnection(_, on: _) = executeAction.connection else {
|
|
return XCTFail("Expected to create a connection")
|
|
}
|
|
XCTAssertEqual(executeAction.request, .scheduleRequestTimeout(for: request, on: mockRequest.eventLoop))
|
|
|
|
let timeoutAction = state.timeoutRequest(request.id)
|
|
XCTAssertEqual(
|
|
timeoutAction.request,
|
|
.failRequest(request, HTTPClientError.connectTimeout, cancelTimeout: false)
|
|
)
|
|
XCTAssertEqual(timeoutAction.connection, .none)
|
|
}
|
|
|
|
func testRequestThatTimesOutAfterAConnectionWasEstablishedSuccessfullyTimesOutWithGenericError() {
|
|
let elg = EmbeddedEventLoopGroup(loops: 1)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
var state = HTTPConnectionPool.StateMachine(
|
|
idGenerator: .init(),
|
|
maximumConcurrentHTTP1Connections: 6,
|
|
retryConnectionEstablishment: true,
|
|
preferHTTP1: true,
|
|
maximumConnectionUses: nil,
|
|
preWarmedHTTP1ConnectionCount: 0
|
|
)
|
|
|
|
let mockRequest1 = MockHTTPScheduableRequest(eventLoop: elg.next(), requiresEventLoopForChannel: false)
|
|
let request1 = HTTPConnectionPool.Request(mockRequest1)
|
|
|
|
let executeAction1 = state.executeRequest(request1)
|
|
guard case .createConnection(let connectionID1, on: let connEL1) = executeAction1.connection else {
|
|
return XCTFail("Expected to create a connection")
|
|
}
|
|
XCTAssert(mockRequest1.eventLoop === connEL1)
|
|
|
|
XCTAssertEqual(executeAction1.request, .scheduleRequestTimeout(for: request1, on: mockRequest1.eventLoop))
|
|
|
|
let mockRequest2 = MockHTTPScheduableRequest(eventLoop: elg.next(), requiresEventLoopForChannel: false)
|
|
let request2 = HTTPConnectionPool.Request(mockRequest2)
|
|
|
|
let executeAction2 = state.executeRequest(request2)
|
|
guard case .createConnection(let connectionID2, on: let connEL2) = executeAction2.connection else {
|
|
return XCTFail("Expected to create a connection")
|
|
}
|
|
XCTAssert(mockRequest2.eventLoop === connEL2)
|
|
|
|
XCTAssertEqual(executeAction2.request, .scheduleRequestTimeout(for: request2, on: connEL1))
|
|
|
|
let failAction = state.failedToCreateNewConnection(
|
|
HTTPClientError.httpProxyHandshakeTimeout,
|
|
connectionID: connectionID1
|
|
)
|
|
guard case .scheduleBackoffTimer(connectionID1, backoff: _, on: let timerEL) = failAction.connection else {
|
|
return XCTFail("Expected to create a backoff timer")
|
|
}
|
|
XCTAssert(timerEL === connEL2)
|
|
XCTAssertEqual(failAction.request, .none)
|
|
|
|
let conn2 = HTTPConnectionPool.Connection.__testOnly_connection(id: connectionID2, eventLoop: connEL2)
|
|
let createdAction = state.newHTTP1ConnectionCreated(conn2)
|
|
|
|
XCTAssertEqual(createdAction.request, .executeRequest(request1, conn2, cancelTimeout: true))
|
|
XCTAssertEqual(createdAction.connection, .none)
|
|
|
|
let timeoutAction = state.timeoutRequest(request2.id)
|
|
XCTAssertEqual(
|
|
timeoutAction.request,
|
|
.failRequest(request2, HTTPClientError.getConnectionFromPoolTimeout, cancelTimeout: false)
|
|
)
|
|
XCTAssertEqual(timeoutAction.connection, .none)
|
|
}
|
|
|
|
func testPrewarmingSimpleFlow() throws {
|
|
let elg = EmbeddedEventLoopGroup(loops: 4)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
var state = HTTPConnectionPool.StateMachine(
|
|
idGenerator: .init(),
|
|
maximumConcurrentHTTP1Connections: 8,
|
|
retryConnectionEstablishment: true,
|
|
preferHTTP1: true,
|
|
maximumConnectionUses: nil,
|
|
preWarmedHTTP1ConnectionCount: 4
|
|
)
|
|
|
|
var connectionIDs = [HTTPConnectionPool.Connection.ID]()
|
|
var connections = MockConnectionPool()
|
|
|
|
// attempt to send one request.
|
|
let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
|
|
let request = HTTPConnectionPool.Request(mockRequest)
|
|
var action = state.executeRequest(request)
|
|
guard case .createConnection(var connectionID, var connectionEL) = action.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
connectionIDs.append(connectionID)
|
|
XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), action.request)
|
|
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
|
|
// We're going to end up creating 5 connections immediately, even though only one is leased: the other 4 are pre-warmed.
|
|
for connectionIndex in 0..<5 {
|
|
let conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
let createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
|
|
switch createdAction.request {
|
|
case .executeRequest(_, let connection, _):
|
|
try connections.execute(mockRequest, on: connection)
|
|
case .none:
|
|
try connections.parkConnection(connectionID)
|
|
default:
|
|
return XCTFail(
|
|
"Unexpected request action \(createdAction.request), connection index: \(connectionIndex)"
|
|
)
|
|
}
|
|
|
|
if connectionIndex == 0,
|
|
case .createConnection(let newConnectionID, let newConnectionEL) = createdAction.connection
|
|
{
|
|
(connectionID, connectionEL) = (newConnectionID, newConnectionEL)
|
|
connectionIDs.append(connectionID)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
} else if connectionIndex < 4,
|
|
case .scheduleTimeoutTimerAndCreateConnection(let timeoutID, let newConnectionID, let newConnectionEL) =
|
|
createdAction.connection
|
|
{
|
|
XCTAssertEqual(connectionID, timeoutID)
|
|
(connectionID, connectionEL) = (newConnectionID, newConnectionEL)
|
|
connectionIDs.append(connectionID)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
} else if connectionIndex == 4, case .scheduleTimeoutTimer = createdAction.connection {
|
|
// Expected, the loop will terminate now.
|
|
()
|
|
} else {
|
|
return XCTFail(
|
|
"Unexpected connection action: \(createdAction.connection) with index \(connectionIndex)"
|
|
)
|
|
}
|
|
}
|
|
|
|
XCTAssertEqual(connections.count, 5)
|
|
XCTAssertEqual(connections.parked, 4)
|
|
XCTAssertEqual(connectionIDs.count, 5)
|
|
|
|
// Now we complete the first request.
|
|
try connections.finishExecution(connectionIDs[0])
|
|
action = state.http1ConnectionReleased(connectionIDs[0])
|
|
guard case .scheduleTimeoutTimer = action.connection else {
|
|
return XCTFail("Unexpected action: \(action.connection)")
|
|
}
|
|
try connections.parkConnection(connectionIDs[0])
|
|
|
|
XCTAssertEqual(connections.count, 5)
|
|
XCTAssertEqual(connections.parked, 5)
|
|
XCTAssertEqual(connectionIDs.count, 5)
|
|
}
|
|
|
|
func testPrewarmingCreatesUpToTheMax() throws {
|
|
let elg = EmbeddedEventLoopGroup(loops: 4)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
var state = HTTPConnectionPool.StateMachine(
|
|
idGenerator: .init(),
|
|
maximumConcurrentHTTP1Connections: 8,
|
|
retryConnectionEstablishment: true,
|
|
preferHTTP1: true,
|
|
maximumConnectionUses: nil,
|
|
preWarmedHTTP1ConnectionCount: 4
|
|
)
|
|
|
|
var connections = MockConnectionPool()
|
|
|
|
// Attempt to send one request. Complete the connection creation immediately, deferring the next connection creation, and then complete the
|
|
// request.
|
|
let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
|
|
let request = HTTPConnectionPool.Request(mockRequest)
|
|
var action = state.executeRequest(request)
|
|
guard case .createConnection(var connectionID, var connectionEL) = action.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), action.request)
|
|
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
var conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
var createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
guard case .createConnection(var newConnectionID, var newConnectionEL) = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
try connections.execute(mockRequest, on: conn)
|
|
try connections.finishExecution(connectionID)
|
|
action = state.http1ConnectionReleased(connectionID)
|
|
|
|
// Here the state machine has _again_ asked us to create a connection. This is because the pre-warming
|
|
// phase takes any opportunity to do that.
|
|
guard
|
|
case .scheduleTimeoutTimerAndCreateConnection(_, let veryDelayedConnectionID, let veryDelayedLoop) = action
|
|
.connection
|
|
else {
|
|
return XCTFail("Unexpected action: \(action.connection)")
|
|
}
|
|
try connections.parkConnection(connectionID)
|
|
|
|
// At this stage we're gonna end up creating 3 connections. No outstanding requests are present, so
|
|
// we only need the pre-warmed set, which includes the one we already made.
|
|
//
|
|
// The first will ask for another connection
|
|
(connectionID, connectionEL) = (newConnectionID, newConnectionEL)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(connectionID)
|
|
|
|
guard
|
|
case .scheduleTimeoutTimerAndCreateConnection(_, let nextConnectionID, let nextConnectionEL) = createdAction
|
|
.connection
|
|
else {
|
|
return XCTFail("Unexpected connection action: \(createdAction.connection)")
|
|
}
|
|
(newConnectionID, newConnectionEL) = (nextConnectionID, nextConnectionEL)
|
|
|
|
// The second one only asks for a timeout.
|
|
(connectionID, connectionEL) = (newConnectionID, newConnectionEL)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(connectionID)
|
|
|
|
guard case .scheduleTimeoutTimer = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
|
|
// Now we should complete the delayed connection request. This will also only ask for a timer.
|
|
(connectionID, connectionEL) = (veryDelayedConnectionID, veryDelayedLoop)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(connectionID)
|
|
|
|
guard case .scheduleTimeoutTimer = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
|
|
XCTAssertEqual(connections.count, 4)
|
|
XCTAssertEqual(connections.parked, 4)
|
|
|
|
// Now we start sending requests. The first 4 requests will be accompanied by requests to create new connections,
|
|
// because as each connection goes out, the pre-warming creates another. We'll let them succeed.
|
|
for _ in 0..<4 {
|
|
let eventLoop = elg.next()
|
|
|
|
let mockRequest = MockHTTPScheduableRequest(eventLoop: eventLoop)
|
|
let request = HTTPConnectionPool.Request(mockRequest)
|
|
let action = state.executeRequest(request)
|
|
|
|
guard
|
|
case .createConnectionAndCancelTimeoutTimer(
|
|
let newConnectionID,
|
|
let newConnectionLoop,
|
|
let activatedConnectionID
|
|
) = action.connection
|
|
else {
|
|
return XCTFail("Unexpected connection action: \(action)")
|
|
}
|
|
|
|
guard case .executeRequest(_, let connection, _) = action.request else {
|
|
return XCTFail("Expected to execute a request next, but got: \(action.request)")
|
|
}
|
|
|
|
try connections.activateConnection(activatedConnectionID)
|
|
try connections.execute(mockRequest, on: connection)
|
|
|
|
// Now create the new connection.
|
|
XCTAssertNoThrow(try connections.createConnection(newConnectionID, on: newConnectionLoop))
|
|
conn = try connections.succeedConnectionCreationHTTP1(newConnectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(newConnectionID)
|
|
}
|
|
|
|
XCTAssertEqual(connections.count, 8)
|
|
XCTAssertEqual(connections.parked, 4)
|
|
|
|
// The next 4 should _not_ ask to create new connections. We're at the cap, and prewarming can't exceed it.
|
|
for _ in 0..<4 {
|
|
let eventLoop = elg.next()
|
|
|
|
let mockRequest = MockHTTPScheduableRequest(eventLoop: eventLoop)
|
|
let request = HTTPConnectionPool.Request(mockRequest)
|
|
let action = state.executeRequest(request)
|
|
|
|
guard case .cancelTimeoutTimer(let activatedConnectionID) = action.connection else {
|
|
return XCTFail("Unexpected connection action: \(action)")
|
|
}
|
|
|
|
guard case .executeRequest(_, let connection, _) = action.request else {
|
|
return XCTFail("Expected to execute a request next, but got: \(action.request)")
|
|
}
|
|
|
|
try connections.activateConnection(activatedConnectionID)
|
|
try connections.execute(mockRequest, on: connection)
|
|
}
|
|
|
|
XCTAssertEqual(connections.count, 8)
|
|
XCTAssertEqual(connections.parked, 0)
|
|
|
|
while let connectionID = connections.randomActiveConnection() {
|
|
try connections.finishExecution(connectionID)
|
|
action = state.http1ConnectionReleased(connectionID)
|
|
|
|
guard case .scheduleTimeoutTimer = action.connection else {
|
|
return XCTFail("Unexpected connection action: \(action.connection)")
|
|
}
|
|
}
|
|
|
|
XCTAssertEqual(connections.count, 8)
|
|
XCTAssertEqual(connections.parked, 0)
|
|
}
|
|
|
|
func testPrewarmingAffectsConnectionFailure() throws {
|
|
struct SomeError: Error {}
|
|
let elg = EmbeddedEventLoopGroup(loops: 4)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
var state = HTTPConnectionPool.StateMachine(
|
|
idGenerator: .init(),
|
|
maximumConcurrentHTTP1Connections: 8,
|
|
retryConnectionEstablishment: true,
|
|
preferHTTP1: true,
|
|
maximumConnectionUses: nil,
|
|
preWarmedHTTP1ConnectionCount: 4
|
|
)
|
|
|
|
var connections = MockConnectionPool()
|
|
|
|
// Attempt to send one request. Complete the connection creation immediately, deferring the next connection creation, and then complete the
|
|
// request.
|
|
let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
|
|
let request = HTTPConnectionPool.Request(mockRequest)
|
|
var action = state.executeRequest(request)
|
|
guard case .createConnection(var connectionID, var connectionEL) = action.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), action.request)
|
|
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
var conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
var createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
guard case .createConnection(var newConnectionID, var newConnectionEL) = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
try connections.execute(mockRequest, on: conn)
|
|
try connections.finishExecution(connectionID)
|
|
action = state.http1ConnectionReleased(connectionID)
|
|
|
|
// Here the state machine has _again_ asked us to create a connection. This is because the pre-warming
|
|
// phase takes any opportunity to do that.
|
|
guard
|
|
case .scheduleTimeoutTimerAndCreateConnection(_, let veryDelayedConnectionID, let veryDelayedLoop) = action
|
|
.connection
|
|
else {
|
|
return XCTFail("Unexpected action: \(action.connection)")
|
|
}
|
|
try connections.parkConnection(connectionID)
|
|
|
|
// At this stage we're gonna end up creating 3 connections. No outstanding requests are present, so
|
|
// we only need the pre-warmed set, which includes the one we already made.
|
|
//
|
|
// The first will ask for another connection
|
|
(connectionID, connectionEL) = (newConnectionID, newConnectionEL)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(connectionID)
|
|
|
|
guard
|
|
case .scheduleTimeoutTimerAndCreateConnection(_, let nextConnectionID, let nextConnectionEL) = createdAction
|
|
.connection
|
|
else {
|
|
return XCTFail("Unexpected connection action: \(createdAction.connection)")
|
|
}
|
|
(newConnectionID, newConnectionEL) = (nextConnectionID, nextConnectionEL)
|
|
|
|
// The second one only asks for a timeout.
|
|
(connectionID, connectionEL) = (newConnectionID, newConnectionEL)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(connectionID)
|
|
|
|
guard case .scheduleTimeoutTimer = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
|
|
// Now we should complete the delayed connection request. This will also only ask for a timer.
|
|
(connectionID, connectionEL) = (veryDelayedConnectionID, veryDelayedLoop)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(connectionID)
|
|
|
|
guard case .scheduleTimeoutTimer = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
|
|
XCTAssertEqual(connections.count, 4)
|
|
XCTAssertEqual(connections.parked, 4)
|
|
|
|
// Now, one of these connections idle-fails.
|
|
let parked = connections.randomParkedConnection()!
|
|
try connections.closeConnection(parked)
|
|
action = state.http1ConnectionClosed(parked.id)
|
|
|
|
guard case .createConnection(var id, on: let loop) = action.connection else {
|
|
return XCTFail("Unexpected connection action: \(action.connection)")
|
|
}
|
|
|
|
// A reasonable request. But it fails!
|
|
//
|
|
// Let's do this next bit a few times to convince ourselves it's a real problem.
|
|
for _ in 0..<8 {
|
|
// We're asked to schedule a backoff timer.
|
|
action = state.failedToCreateNewConnection(SomeError(), connectionID: id)
|
|
guard case .scheduleBackoffTimer(let backoffID, _, _) = action.connection else {
|
|
return XCTFail("Unexpected connection action: \(action.connection)")
|
|
}
|
|
XCTAssertEqual(backoffID, id)
|
|
|
|
// Once it passes, ask what to do. We'll be asked, again, to create a connection.
|
|
action = state.connectionCreationBackoffDone(backoffID)
|
|
guard case .createConnection(let backedOffID, on: let backedOffLoop) = action.connection else {
|
|
return XCTFail("Unexpected connection action: \(action.connection)")
|
|
}
|
|
XCTAssertNotEqual(backedOffID, id)
|
|
XCTAssertIdentical(backedOffLoop, loop)
|
|
id = backedOffID
|
|
}
|
|
|
|
// Finally it works.
|
|
XCTAssertNoThrow(try connections.createConnection(id, on: loop))
|
|
conn = try connections.succeedConnectionCreationHTTP1(id)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(id)
|
|
|
|
guard case .scheduleTimeoutTimer = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
}
|
|
|
|
func testIdleConnectionTimeoutHandlingWithPrewarming() throws {
|
|
let elg = EmbeddedEventLoopGroup(loops: 4)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
var state = HTTPConnectionPool.StateMachine(
|
|
idGenerator: .init(),
|
|
maximumConcurrentHTTP1Connections: 8,
|
|
retryConnectionEstablishment: true,
|
|
preferHTTP1: true,
|
|
maximumConnectionUses: nil,
|
|
preWarmedHTTP1ConnectionCount: 4
|
|
)
|
|
|
|
var connections = MockConnectionPool()
|
|
|
|
// Attempt to send one request. Complete the connection creation immediately, deferring the next connection creation, and then complete the
|
|
// request.
|
|
var mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
|
|
var request = HTTPConnectionPool.Request(mockRequest)
|
|
var action = state.executeRequest(request)
|
|
guard case .createConnection(var connectionID, var connectionEL) = action.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), action.request)
|
|
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
var conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
var createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
guard case .createConnection(var newConnectionID, var newConnectionEL) = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
try connections.execute(mockRequest, on: conn)
|
|
try connections.finishExecution(connectionID)
|
|
action = state.http1ConnectionReleased(connectionID)
|
|
|
|
// Here the state machine has _again_ asked us to create a connection. This is because the pre-warming
|
|
// phase takes any opportunity to do that.
|
|
guard
|
|
case .scheduleTimeoutTimerAndCreateConnection(_, let veryDelayedConnectionID, let veryDelayedLoop) = action
|
|
.connection
|
|
else {
|
|
return XCTFail("Unexpected action: \(action.connection)")
|
|
}
|
|
try connections.parkConnection(connectionID)
|
|
|
|
// At this stage we're gonna end up creating 3 connections. No outstanding requests are present, so
|
|
// we only need the pre-warmed set, which includes the one we already made.
|
|
//
|
|
// The first will ask for another connection
|
|
(connectionID, connectionEL) = (newConnectionID, newConnectionEL)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(connectionID)
|
|
|
|
guard
|
|
case .scheduleTimeoutTimerAndCreateConnection(_, let nextConnectionID, let nextConnectionEL) = createdAction
|
|
.connection
|
|
else {
|
|
return XCTFail("Unexpected connection action: \(createdAction.connection)")
|
|
}
|
|
(newConnectionID, newConnectionEL) = (nextConnectionID, nextConnectionEL)
|
|
|
|
// The second one only asks for a timeout.
|
|
(connectionID, connectionEL) = (newConnectionID, newConnectionEL)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(connectionID)
|
|
|
|
guard case .scheduleTimeoutTimer = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
|
|
// Now we should complete the delayed connection request. This will also only ask for a timer.
|
|
(connectionID, connectionEL) = (veryDelayedConnectionID, veryDelayedLoop)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(connectionID)
|
|
|
|
guard case .scheduleTimeoutTimer = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
|
|
XCTAssertEqual(connections.count, 4)
|
|
XCTAssertEqual(connections.parked, 4)
|
|
|
|
// Now, the idle timeout timer fires. We can do this a few times, it'll keep
|
|
// re-arming.
|
|
for _ in 0..<8 {
|
|
action = state.connectionIdleTimeout(connectionID, on: connectionEL)
|
|
guard case .scheduleTimeoutTimer = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
}
|
|
|
|
// Let's force another connection to be created for a request.
|
|
mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
|
|
request = HTTPConnectionPool.Request(mockRequest)
|
|
action = state.executeRequest(request)
|
|
guard
|
|
case .createConnectionAndCancelTimeoutTimer(let extraConnectionID, let extraConnectionEL, _) = action
|
|
.connection
|
|
else {
|
|
return XCTFail("Unexpected connection action: \(action.connection)")
|
|
}
|
|
guard case .executeRequest(_, let requestConnection, _) = action.request else {
|
|
return XCTFail("Unexpected request action")
|
|
}
|
|
|
|
XCTAssertNoThrow(try connections.createConnection(extraConnectionID, on: extraConnectionEL))
|
|
conn = try connections.succeedConnectionCreationHTTP1(extraConnectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
guard case .scheduleTimeoutTimer = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action: \(createdAction.connection)")
|
|
}
|
|
try connections.activateConnection(requestConnection.id)
|
|
try connections.execute(mockRequest, on: requestConnection)
|
|
try connections.finishExecution(requestConnection.id)
|
|
try connections.parkConnection(requestConnection.id)
|
|
action = state.http1ConnectionReleased(requestConnection.id)
|
|
|
|
// Back to idle.
|
|
guard case .scheduleTimeoutTimer = action.connection else {
|
|
return XCTFail("Unexpected action: \(action.connection)")
|
|
}
|
|
try connections.parkConnection(extraConnectionID)
|
|
|
|
XCTAssertEqual(connections.count, 5)
|
|
XCTAssertEqual(connections.parked, 5)
|
|
|
|
// This time when the idle timeout fires, we're actually asked to close the connection.
|
|
action = state.connectionIdleTimeout(connectionID, on: connectionEL)
|
|
guard case .closeConnection = action.connection else {
|
|
return XCTFail("Unexpected connection action: \(createdAction.connection)")
|
|
}
|
|
}
|
|
|
|
func testPrewarmingForcesReCreationOfConnectionsWhenTheyHitMaxUses() throws {
|
|
let elg = EmbeddedEventLoopGroup(loops: 4)
|
|
defer { XCTAssertNoThrow(try elg.syncShutdownGracefully()) }
|
|
|
|
// The scenario we want to hit can only happen when there is never a spare pre-warmed connection
|
|
// in the pool _and_ we can't create more. The easiest way to test this is to just
|
|
// create pre-warmed connections up to the pool limit, which they won't pass.
|
|
var state = HTTPConnectionPool.StateMachine(
|
|
idGenerator: .init(),
|
|
maximumConcurrentHTTP1Connections: 8,
|
|
retryConnectionEstablishment: true,
|
|
preferHTTP1: true,
|
|
maximumConnectionUses: 1,
|
|
preWarmedHTTP1ConnectionCount: 8
|
|
)
|
|
|
|
var connections = MockConnectionPool()
|
|
|
|
// Attempt to send one request. Complete the connection creation immediately, deferring the next connection creation, but don't
|
|
// complete the request.
|
|
let mockRequest = MockHTTPScheduableRequest(eventLoop: elg.next())
|
|
let request = HTTPConnectionPool.Request(mockRequest)
|
|
var action = state.executeRequest(request)
|
|
guard case .createConnection(var connectionID, var connectionEL) = action.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
XCTAssertEqual(.scheduleRequestTimeout(for: request, on: mockRequest.eventLoop), action.request)
|
|
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
var conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
var createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(connectionID)
|
|
guard case .createConnection(var newConnectionID, var newConnectionEL) = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action")
|
|
}
|
|
guard case .executeRequest(_, let requestConn, _) = createdAction.request else {
|
|
return XCTFail("Unexpected request action: \(action.request)")
|
|
}
|
|
|
|
// At this stage we're gonna end up creating 7 more connections. No outstanding requests are present, so
|
|
// we only need the pre-warmed set, which includes the one we already made.
|
|
//
|
|
// The first six will ask for another connection.
|
|
for _ in 0..<6 {
|
|
(connectionID, connectionEL) = (newConnectionID, newConnectionEL)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(connectionID)
|
|
|
|
guard
|
|
case .scheduleTimeoutTimerAndCreateConnection(_, let nextConnectionID, let nextConnectionEL) =
|
|
createdAction.connection
|
|
else {
|
|
return XCTFail("Unexpected connection action: \(createdAction.connection)")
|
|
}
|
|
(newConnectionID, newConnectionEL) = (nextConnectionID, nextConnectionEL)
|
|
}
|
|
|
|
// The seventh one only asks for a timeout.
|
|
(connectionID, connectionEL) = (newConnectionID, newConnectionEL)
|
|
XCTAssertNoThrow(try connections.createConnection(connectionID, on: connectionEL))
|
|
conn = try connections.succeedConnectionCreationHTTP1(connectionID)
|
|
createdAction = state.newHTTP1ConnectionCreated(conn)
|
|
try connections.parkConnection(connectionID)
|
|
|
|
guard case .scheduleTimeoutTimer = createdAction.connection else {
|
|
return XCTFail("Unexpected connection action: \(createdAction.connection)")
|
|
}
|
|
|
|
XCTAssertEqual(connections.count, 8)
|
|
XCTAssertEqual(connections.parked, 8)
|
|
|
|
// Now we're gonna actually complete that request from earlier.
|
|
try connections.activateConnection(requestConn.id)
|
|
try connections.execute(mockRequest, on: requestConn)
|
|
try connections.finishExecution(requestConn.id)
|
|
action = state.http1ConnectionReleased(requestConn.id)
|
|
|
|
// Here the state machine has asked us to close the connection and create a new one. That's because we've hit the
|
|
// max usages limit.
|
|
guard case .closeConnectionAndCreateConnection(let toClose, _, _) = action.connection else {
|
|
return XCTFail("Unexpected action: \(action.connection)")
|
|
}
|
|
try connections.closeConnection(toClose)
|
|
|
|
// We won't bother doing it though, it's enough that it asked.
|
|
}
|
|
}
|